How to identify whether there is roller bearing fault or not?

As is known to all, roller is the main part of belt conveyor, while bearing is the precision part of roller, but in the process of using, bearing is the most prone to fail, then how to troubleshoot the problem? It is important to improve the productivity and economy if it can be identified and predicted by the not removal of the bearing in the operation. 

First of all, we can judge whether there is failure by sound, but this requires operators with rich experience and rigorous training to identify there is bearing noise;
Then, it can be judged according to the equipment temperature . There are some limitations of this method, we need to record temperature changes to determine whether the bearing fault or not only in the operating state;
Finally, when lubricate the bearing, we can also judge bearing whether there is fault or hidden trouble from dirty lubricant, if it is mixed with foreign matter ,other metal powder or dust, the bearing is bound to a fail.   

The factors of affecting dysfunctional roller

Manufacturing quality conveyor idlers. Conveyor idlers problem mainly in the manufacture of bearing stiffness is not enough, it is difficult to ensure the idler assembly precision, thereby constraining the flexibility roller operation.

Seal lubrication and maintenance. Since the conveyor working environment is more severe, in general, the use of on-site dust are big, big bearing seal in the form of impact on the operation of the roller flexibility, if the seal is not good, it is easy to enter the dirt cause the bearing roller rotation is not flexible: in addition, the bearing grease if the general calcium-based grease dries easily change color, can not play a good lubrication.
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how to solve Conveyor idlers dysfunctional ?

Roller operation flexible approach:
On roller manufacturing process to ensure the accuracy requirements, such as precision stamping bearing bore to reach three, dimensional tolerances of the pipe ends, concentricity and ovality must meet the national standard, not tolerance.
Sealed lubrication, in addition to manufacturing quality assurance, but to go with a good lubricating materials, such as lithium grease, can be improved bearing lubrication, which prolong the service life of the roller is necessary.
Bearing radial ball bearings using plastic sealing ring labyrinth seal structure, so that can guarantee work roller reasonable force, while good dust effects, resistance, and easy assembly and disassembly, easy to maintain, can effectively reduce the transport machine operating costs.

Application of Sidewall Belt Conveyor in Thermal Power Plant

1.Requirements
Sidewall belt conveyor is the major equipment to convey coal and lime-ash in thermal power plant. Therefore it has high requirements for the security of equipment. Generally speaking, the whole transit line is equipped with twin channel sidewall belt conveyor, one is put into use, another is as standby application device. Thus, this coal handling system must be equipped with sidewall belt conveyor with 2500m-3000m length. Applying sidewall belt conveyor to thermal powder plant, it can not only simplify procedure, but also save cost.
2.Features
Due to power plant has high requirements for the security of equipment, technical requirements of sidewall belt conveyor are as follows:
1) It has different requirements for belt conveyor when it used to receive, convey or discharge materials. For instance, if the belt conveyor is used to receive materials, the belt speed of it shouldn’t be too high. If it is used to convey materials, it requires that trough angle of idler decrease properly. If plow discharger is put into use, the cover rubber of belt surface should be thicken properly. 
2)The belt speed should be low. Belt conveyor is mostly arranged in workshop, so it has high requirements for coal dust control. According to domestic and foreign practical experience, it’s better to adopt lower speed.
3)After installation of this machine, it seldom changes its layout.
4)Different coal type has different requirements for belt conveyor. For example, large coal particle size needs impact idler with high quality. Coal with less water and more dust needs guide chute with good sealing.